Flask



FIG. 1 is a perspective view showing a flask of my new design;

FIG. 2 is a front elevational view thereof, the rear, right and left end elevational views being identical therewith;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan thereof; and,

FIG. 5 is a cross-sectional view taken along the line 5--5 in FIG. 2. 

The ornamental design for a flask, as shown and described. 